skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A novel artificial condensed matter lattice and a new platform for one-dimensional topological phases

Abstract

Engineered lattices in condensed matter physics, such as cold-atom optical lattices or photonic crystals, can have properties that are fundamentally different from those of naturally occurring electronic crystals. We report a novel type of artificial quantum matter lattice. Our lattice is a multilayer heterostructure built from alternating thin films of topological and trivial insulators. Each interface within the heterostructure hosts a set of topologically protected interface states, and by making the layers sufficiently thin, we demonstrate for the first time a hybridization of interface states across layers. In this way, our heterostructure forms an emergent atomic chain, where the interfaces act as lattice sites and the interface states act as atomic orbitals, as seen from our measurements by angle-resolved photoemission spectroscopy. By changing the composition of the heterostructure, we can directly control hopping between lattice sites. We realize a topological and a trivial phase in our superlattice band structure. We argue that the superlattice may be characterized in a significant way by a one-dimensional topological invariant, closely related to the invariant of the Su-Schrieffer-Heeger model. Our topological insulator heterostructure demonstrates a novel experimental platform where we can engineer band structures by directly controlling how electrons hop between lattice sites.

Authors:
 [1];  [1];  [2];  [3];  [1];  [4]; ORCiD logo [5];  [6];  [1];  [1];  [1];  [2];  [7];  [8];  [4];  [9];  [9];  [9];  [9];  [9] more »;  [4]; ORCiD logo [5];  [8];  [2];  [10] « less
  1. Princeton Univ., Princeton, NJ (United States)
  2. Rutgers, The State Univ. of New Jersey, Piscataway, NJ (United States)
  3. South Univ. of Science and Technology of China, Guangdong (China)
  4. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  5. National Univ. of Singapore (Singapore)
  6. Univ. of Central Florida, Orlando, FL (United States)
  7. Paul Scherrer Inst. (PSI), Villigen (Switzerland); Univ. Wurzburg, Wurzburg (Germany)
  8. Diamond Light Source, Didcot (United Kingdom)
  9. Synchrotron SOLEIL, Gif-sur-Yvette (France)
  10. Princeton Univ., Princeton, NJ (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1419432
Grant/Contract Number:
AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 3; Journal Issue: 3; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Belopolski, Ilya, Xu, Su -Yang, Koirala, Nikesh, Liu, Chang, Bian, Guang, Strocov, Vladimir N., Chang, Guoqing, Neupane, Madhab, Alidoust, Nasser, Sanchez, Daniel, Zheng, Hao, Brahlek, Matthew, Rogalev, Victor, Kim, Timur, Plumb, Nicholas C., Chen, Chaoyu, Bertran, Francois, Le Fevre, Patrick, Taleb-Ibrahimi, Amina, Asensio, Maria -Carmen, Shi, Ming, Lin, Hsin, Hoesch, Moritz, Oh, Seongshik, and Hasan, M. Zahid. A novel artificial condensed matter lattice and a new platform for one-dimensional topological phases. United States: N. p., 2017. Web. doi:10.1126/sciadv.1501692.
Belopolski, Ilya, Xu, Su -Yang, Koirala, Nikesh, Liu, Chang, Bian, Guang, Strocov, Vladimir N., Chang, Guoqing, Neupane, Madhab, Alidoust, Nasser, Sanchez, Daniel, Zheng, Hao, Brahlek, Matthew, Rogalev, Victor, Kim, Timur, Plumb, Nicholas C., Chen, Chaoyu, Bertran, Francois, Le Fevre, Patrick, Taleb-Ibrahimi, Amina, Asensio, Maria -Carmen, Shi, Ming, Lin, Hsin, Hoesch, Moritz, Oh, Seongshik, & Hasan, M. Zahid. A novel artificial condensed matter lattice and a new platform for one-dimensional topological phases. United States. doi:10.1126/sciadv.1501692.
Belopolski, Ilya, Xu, Su -Yang, Koirala, Nikesh, Liu, Chang, Bian, Guang, Strocov, Vladimir N., Chang, Guoqing, Neupane, Madhab, Alidoust, Nasser, Sanchez, Daniel, Zheng, Hao, Brahlek, Matthew, Rogalev, Victor, Kim, Timur, Plumb, Nicholas C., Chen, Chaoyu, Bertran, Francois, Le Fevre, Patrick, Taleb-Ibrahimi, Amina, Asensio, Maria -Carmen, Shi, Ming, Lin, Hsin, Hoesch, Moritz, Oh, Seongshik, and Hasan, M. Zahid. Fri . "A novel artificial condensed matter lattice and a new platform for one-dimensional topological phases". United States. doi:10.1126/sciadv.1501692. https://www.osti.gov/servlets/purl/1419432.
@article{osti_1419432,
title = {A novel artificial condensed matter lattice and a new platform for one-dimensional topological phases},
author = {Belopolski, Ilya and Xu, Su -Yang and Koirala, Nikesh and Liu, Chang and Bian, Guang and Strocov, Vladimir N. and Chang, Guoqing and Neupane, Madhab and Alidoust, Nasser and Sanchez, Daniel and Zheng, Hao and Brahlek, Matthew and Rogalev, Victor and Kim, Timur and Plumb, Nicholas C. and Chen, Chaoyu and Bertran, Francois and Le Fevre, Patrick and Taleb-Ibrahimi, Amina and Asensio, Maria -Carmen and Shi, Ming and Lin, Hsin and Hoesch, Moritz and Oh, Seongshik and Hasan, M. Zahid},
abstractNote = {Engineered lattices in condensed matter physics, such as cold-atom optical lattices or photonic crystals, can have properties that are fundamentally different from those of naturally occurring electronic crystals. We report a novel type of artificial quantum matter lattice. Our lattice is a multilayer heterostructure built from alternating thin films of topological and trivial insulators. Each interface within the heterostructure hosts a set of topologically protected interface states, and by making the layers sufficiently thin, we demonstrate for the first time a hybridization of interface states across layers. In this way, our heterostructure forms an emergent atomic chain, where the interfaces act as lattice sites and the interface states act as atomic orbitals, as seen from our measurements by angle-resolved photoemission spectroscopy. By changing the composition of the heterostructure, we can directly control hopping between lattice sites. We realize a topological and a trivial phase in our superlattice band structure. We argue that the superlattice may be characterized in a significant way by a one-dimensional topological invariant, closely related to the invariant of the Su-Schrieffer-Heeger model. Our topological insulator heterostructure demonstrates a novel experimental platform where we can engineer band structures by directly controlling how electrons hop between lattice sites.},
doi = {10.1126/sciadv.1501692},
journal = {Science Advances},
number = 3,
volume = 3,
place = {United States},
year = {Fri Mar 24 00:00:00 EDT 2017},
month = {Fri Mar 24 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 1work
Citation information provided by
Web of Science

Save / Share:
  • A three-dimensional analysis of the dynamics of hydrogen isotopes confined within a metal lattice, like palladium or nickel, is presented. It is assumed that the concentration of the hydrogen isotopes, as an atomic fraction, is close to unity and that coherent oscillations of the metal atom electrons near to the Fermi level take place. Coherent oscillations of the Fermi-level electrons in the metal lattice can produce an oscillating electric field within the cell and hence produce a radio-frequency oscillation of ions like protons or deuterons. The trajectories of the ions can be studied by means of the equations of motion.more » The results show that under proper initial conditions, the closest distance of approach between two ions or between an ion and the nucleus of an atom of the host metal lattice can be reduced below 0.1 Angst. An evaluation of the excess of heat production has been done for the D-D reaction within a Pd lattice by approximating the reaction both to an s-wave and a d-wave process, respectively. Last, the effect of the lattice field, which causes the collisions between ions, on the nuclear reaction channel for the D-D reaction is investigated by evaluating the transition probability for a stimulated decay.« less
  • In a basic physical model where two-dimensional (2D) matter-wave solitons may be stable, namely, the Gross-Pitaevskii equation with the self-attractive nonlinearity and quasi-one-dimensional (1D) optical-lattice (OL) potential, we test robustness of the solitons against periodic time modulation of the OL strength. Stability diagrams for the 2D solitons are presented in the plane of the modulation depth and frequency. Basic features of the diagrams are explained with the help of the variational approximation for the stationary counterpart of the model. In the Bose-Einstein condensate of {sup 7}Li atoms, the stable 2D solitons may contain the number of atoms in the rangemore » of 10{sup 4}-10{sup 5}, relevant values of the OL strength and modulation frequency being, respectively < or approx. 5 recoil energies and < or approx. 10 kHZ. Head-on collisions between stable 2D solitons moving in the unconfined direction are studied in detail too, for velocities up to {approx}5 cm/s. A border between quasi-elastic collisions and merger of the solitons into a single localized state is identified. In some cases, the soliton produced by the merger is stable against collapse, which was not observed before in the static OL potential either.« less
  • We discuss a model of dipolar bosons trapped in a weakly coupled planar array of one-dimensional tubes. We consider the situation where the dipolar moments are aligned by an external field, and we find a rich phase diagram as a function of the angle of this field exhibiting quantum phase transitions between solid, superfluid, and supersolid phases. In the low energy limit, the model turns out to be identical to one describing quasi-one-dimensional superconductivity in condensed matter systems. This opens the possibility of using bosons as a quantum analog simulator of electronic systems, a scenario arising from the intricate relationmore » between statistics and interactions in quasi-one-dimensional systems.« less
  • The hydrothermal syntheses, X-ray single-crystal structures, and some properties of Ba(VO){sub 2}(SeO{sub 3}){sub 2}(HSeO{sub 3}){sub 2} and Ba{sub 8}(VO){sub 6}(PO{sub 4}){sub 2}(HPO{sub 4}){sub 11}{center_dot}3H{sub 2}O are described. Ba(VO){sub 2}(SeO{sub 3}){sub 2}(HSeO{sub 3}){sub 2} contains a three-dimensional network of VO{sub 6} and (H)SeO{sub 3} polyhedra, linked via V-O-Se bonds. The Ba cation is 10-coordinate, the VO{sub 6} group contains a short vanadyl V{double_bond}O bond typical of V{sup IV}, and the (H)SeO{sub 3} groups are pyramidal. Magnetic susceptibility data are consistent with V{sup IV} and show paramagnetic behavior from 4 to 300 K. Crystal data for Ba(VO){sub 2}(SeO{sub 3}){sub 2}(HSeO{sub 3}){sub 2}:M{submore » r} = 781.06, monoclinic, space group P2{sub 1}/c (No. 14), a = 9.680(3) {angstrom}, b = 7.024(2) {angstrom}, c = 9.882(4) {angstrom}, {beta} = 116.42(3){degrees}, V = 601.75 {angstrom}{sup 3}, Z = 2, R = 3.89%, R{sub w} = 3.64% [1637 observed reflections with I > 3{sigma}(I)]. Ba{sub 8}(VO){sub 6}(PO{sub 4}){sub 2}(HPO{sub 4}){sub 11}{center_dot}3H{sub 2}O contains a complex network of VO{sub 6} and PO{sub 4}/HPO{sub 4} groups, which form two different types of one-dimensional chains: one chain contains fairly regular V{sup IV}O{sub 6} and (H)PO{sub 4} groups; the other is built up from distorted V{sup IV}O{sub 6} octahedra and (hydrogen) phosphate groups. 10- and 13-coordinate Ba{sup 2+} cations complete the structure, which shows antiferromagnetic ordering of the V{sup IV} centers at {approximately}20 K. Crystal data for Ba{sub 8}(VO){sub 6}(PO{sub 4}){sub 2}(HPO{sub 4}){sub 11}{center_dot}3H{sub 2}O: M{sub r} = 2800.05, monoclinic, space group C2/m (No. 12), a = 31.685(11) {angstrom}, b = 5.208(2) {angstrom}, c = 7.784(3) {angstrom}, {beta} = 90.59(3){degrees}, V = 1284.5(7) {angstrom}{sup 3}, Z = 1, R = 4.03%, and R{sub w} = 5.28% [1892 observed reflections with I > 3{sigma}(I)].« less